Make sure the already existing X509_STORE->depth variable is initialized

in X509_STORE_new(), but document the fact that this variable is still
unused in the certificate verification process.

crypto/x509/x509_lu.c

@@ -231,6 +231,7 @@ X509_STORE *X509_STORE_new()
 	ret->verify_cb=NULL;
 	memset(&ret->ex_data,0,sizeof(CRYPTO_EX_DATA));
 	ret->references=1;
+	ret->depth=0;
 	return(ret);
 	}
 

crypto/x509/x509_vfy.h

@@ -154,7 +154,7 @@ typedef struct x509_store_st
 
 	CRYPTO_EX_DATA ex_data;
 	int references;
-	int depth;		/* how deep to look */
+	int depth;		/* how deep to look (still unused) */
 	}  X509_STORE;
 
 #define X509_STORE_set_depth(ctx,d)       ((ctx)->depth=(d))